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Home >> Isuzu >> 1999 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests (2.2L) >> Diagnostic Trouble Code Identification >> DTC P0113: IAT Sensor Circuit High Input >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Turn ignition on. Using scan tool, read IAT value. If temperature reading is less than 5 volts, -36°F (-38°C), go to step  4 . If temperature reading is not 5 volts, -36°F (-38°C), go to next step.
  3. Using scan tool, read and record FAILURE RECORDS data. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0113 FAILED THIS IGN, test IAT sensor. Using a DVOM, measure resistance across sensor terminals. See IAT SENSOR RESISTANCE  table under DTC P0112. Replace IAT sensor if resistance is not as specified. If scan tool does not display DTC P0113 FAILED THIS IGN, go to DIAGNOSTIC AIDS  .
  4. Turn ignition off. Disconnect IAT sensor harness connector. Using a fused jumper wire, connect terminals of IAT sensor connector. Turn ignition on. Using scan tool, read IAT value. If reading is zero volts and 284°F (140°C), go to step  6 . If reading is not zero volts and 284°F (140°C), go to next step.
  5. Turn ignition off. Connect jumper between IAT sensor input and chassis ground terminals of IAT harness connector. Turn ignition on and observe IAT sensor value. If reading is zero volts and 284°F (140°C), go to next step. If reading is not zero volts and 284°F (140°C), go to step  8 .
  6. Check for poor connections at IAT sensor and connector. Repair as necessary. If terminals and connector are okay, go to next step.
  7. Turn ignition off. Disconnect PCM connector. Check IAT sensor ground circuit for an open condition. Repair as necessary. Retest system. If IAT ground circuit is okay, go to step  9 .
  8. Turn ignition off. Disconnect PCM connector. Check IAT sensor input circuit for an open condition. Repair as necessary. Retest system. If IAT sensor input circuit is okay, then go to next step.
  9. Check PCM and harness connector for poor connections or damaged terminals. Repair as necessary. Retest system. If terminals are okay, go to step  11 .
  10. Replace IAT sensor. Retest system.
  11. Replace PCM. Program replacement PCM using required equipment. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION. Retest system.
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